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645Ci

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Warning lights while driving
There can be a lot of things that could cause all of your warning lights to come on. Low battery voltage loves to reek havoc on any electrical systems and a low charging alternator would be the simplest repair. It...
Question
White smoke coming from tailpipe
Hi! The white smoke is a sign that the engines head gasket has blown and is leaking coolant into the combustion chamber. The coolant leaked into the hot combustion chamber then burns off in the form of white smoke exiting...
Question
Advice what to check or replace.
Hello. The code P0370 is an indicator that your vehicle's timing reference optical sensor is having an issue. This signal that this sensor provides for the computer is very important to the overall engine performance of the vehicle, especially at...
Question
Xenon lights only dim when switched on
Hello, thanks for writing in about your 645Ci. From what you've described, the bulbs will need to be replaced most likely. They will become very dim when they are going out and will shut off completely at any moment at...
Question
Battery dead after car sat for one month
Hi there. It sounds like the battery has an internal short. I would replace the battery. I would also make sure that the connections at the battery cables are clean and tight. If they are loose at all, then the...
Question
Key will lock doors and trunk, but not unlock doors on 2004 BMW 645Ci
Hi there. The first thing I would do is try another key to see if you get the same results from the key control. If the separate key works, then it is the key that is the problem. If...
Question
Convertible top malfunctioning and warning lights stay on
Hello. It sounds like the motor that moves the top is failing. When the electric motor fails, this will occur. I usually start by scanning the computer for codes to see if anything comes up. If not, then I apply...
Question
No one can replace AC compressor belt after it snapped
Hello. In order to install a new belt, you will need to use a torx bit on the tensioner to move it. These tensioners are not easy to move and the torx is easy to strip out. I usually use...
Question
2005 BMW 645Ci only shifts and drives in 1st and 2nd gears
Hello. I would need to check the transmission fluid condition to tell you for sure what is going on. If the fluid is dark or smells burnt then it more than likely needs a transmission. I usually scan the computer...
Question
Buying a car
As you may know with any car, a large factor in it's dependability is how well it has been taken care of or maintained in the past. Things like regular services (i.e. oil changes, brake services, tune ups, tire rotations,...
Question
Is this a reliable car from what you've encountered? Common repairs?
The National Highway Traffic Safety Administration (NHTSA, www.nhtsa.gov) maintains a database of consumer complaints, official recalls and factory service bulletins for all makes and models. I encourage you to go to that website and enter your vehicle's year, make and...
Question
How long is battery warranty and can I get an upgraded battery?
Your car's battery warranty is subject to the manufacturer of the specific battery in your car and relative to the time period in which you have had it. Many battery suppliers have various warranty periods. I would recommend taking the...
Question
Should I purchase.
Hi there: As the owner of a 2008 BMW 128i convertible with 100,000 miles, I understand some of the benefits of having that type of 'weekend cruiser' in the garage. In general, BMW's have a few common issues that tend...

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